I need help. I need it so bad. My throat is closing and I can’t breath right

Have been struggling with somatic breathing ocd. I start feeling like I can’t breathe and start feeling faint. I have a performance this weekend and my biggest fear is that I won’t be able to sing. I worry that I’m not gonna be able to perform cause it also causes a wave of fear and I’m scared I’m gonna feel too faint where I’m gonna have to go run off stage. I start hyperventilating and I don’t know how to stop it. My mind just makes me aware and then I eventually start hyperventilating. Any tips? I’ve tried just acknowledging it but it hasn’t helped the hyperventilating much. Any tips please? I have to go on stage for tech in 50 mins

I feel like I’m going to stop breathing and it makes it seem like an effort just to do it. I just want to be normal again and have my breathing go back to being automatic. Idk how to beat this, I’m constantly worried about it

I’m very overwhelmed anxiety been through the roof